Texas Instruments BQ25157, Manual

Page: 22 / 110

9.3.3.3 ADC Measurements
Table 9-2 below lists the ADC measurements done by the ADC.
Table 9-2. ADC Measurement Channels
MEASUREMENT
FULL SCALE RANGE
(ABSOLUTE MAX CODE)
FULL LINEAR RANGE
(RECOMMENDED
OPERATING RANGE)
FORMULA
VIN 6 V 2 V - 5 V
16
16
_
6
2
bit
IN
ADCDATA VIN
V V
u
(6)
PMID 6 V 2 V - 5 V
16
16
_
6
2
bit
PMID
ADCDATA PMID
V V u
(7)
IIN 750 mA 0 - 600 mA
For ILIM ≤ 150mA:
16
16
_
375
2
bit
IN
ADCDATA IIN
I mA
u
(8)
For ILIM >150mA:
16
16
_
750
2
bit
IN
ADCDATA IIN
I mA
u
(9)
Note: IIN reading only valid when V
IN
> V
UVLO
and V
IN
<
V
OVP
VBAT 6 V 2 V - 5 V
16
16
_
6
2
bit
ADCDATA VBAT
VBAT V
u
(10)
TS 1.2 V 0 - 1 V
16
16
_
1.2
2
bit
TS
ADCDATA TS
V V
u
(11)
ADCIN 1.2 V 0 - 1 V
16
16
_
1.2
2
bit
ADCIN
ADCDATA ADCIN
V V
u
(12)
% ICHARGE - -
16
16
_
% 100
0.8 2
bit
CHARGE
ADCDATA ICHG
I
u
u
(13)
where I
CHARGE
is the charge current setting. Note that if
the device is in pre-charge or in the TS COLD region,
I
CHARGE
will be the current set by the IPRECHRG and
TS_ICHRG bits respectively.
9.3.3.4 ADC Programmable Comparators
The BQ25157 has three programmable ADC comparators that may be used to monitor any of the ADC channels
as configured through the ADCTRL0 and ADCCTRL1 registers. The comparators will send an interrupt
whenever the ADC measurement the comparator is monitoring crosses the thresholds programmed in their
respective ADC_ALARM_COMPx registers in the direction indicated by the x_ADCALARM_ABOVE bit. The
comparators are only 12 bit compared to the 16 bits reported by the ADC, so only the first 12 bits of the ADC
measurements are used to make the comparison. Note that the interrupts are masked by default and must be
unmasked by the host to use this function.
BQ25157
SLUSEC5 – DECEMBER 2020
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